The story behind the Cloth Room has been explained long ago. Long story short, and as far as I can remember: there was a freeze in its development or in any form of update, because of copyright issues on some parts.
It's true that "they could have let it available till a new version", but my feeling, as a retired developer is that porting it to the new Poser 14 could have generated a lot of headaches. This is a situation I encountered a long time ago in my career.

 For the question regarding EZSkin and the PrincilpedBSDF-based plugin: I'm studying the new version. I think that a version of the plugin compatible with either Poser 13 and Poser 14 will be available either in a few hours or tomorrow.

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gaming, Asus Tuf Gaming RTX 4070 OC Edition, 1+2 TB SSD's, 6+4TB HD
👿 Mac Mini M2, Tahoe 26.5, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and 14 ❤️

𝑀𝓎 𝒢𝒶𝓁𝓁𝑒𝓇𝓎